Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, -1), (0, 1, 1), (1, -1, 0)}.
A148174
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, -1), (0, 1, 1), (1, -1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =27a(6) =84a(7) =224a(8) =712a(9) =2006a(10) =6662a(11) =19530a(12) =66075a(13) =200809a(14) =687115a(15) =2142561a(16) =7425605a(17) =23578903a(18) =82400432a(19) =266087903a(20) =936840796a(21) =3062357204a(22) =10851189800a(23) =35873694160a(24) =127705408346a(25) =426238811147
External references
- oeis: A148174